Field-pole construction



Ewe/Moro flame/ 9 R W BORCHARD FIELD POLE CONSTRUCTION fiiledJune 6. 1921 r 5M5, Y (23kg. S

Aug. 12 1924.

Patented Aug. 12, 1924.

UNITED STA TES PATENT OFFICE.

ROBERT W. BDRCHARD, 20F MILWAUKEE, WISCONSIN, ASSIGNOR TO.ALLIS-CI-IALMERS MANUFACTURING COMPANY, OF :MILWAU'KEE, WISCONSIN, .A CORPORATION OF DELAWARE.

FIELD-POLE CONSTRUCTION.

Application filed J 'une 6,

T a'll'whom it may concern Be it known that Bonn-Br W. BORCHARD, a citizen o f the United States, residing-at Milwaukee, in the county of Milwaukee and State of iVisconsin, has invented a certain new and useful Improvement in Field Pole Constructions, of which the following is a specification.

This invention relates to pole end-plates,

and more specifically to fabricated pole end plates Pole end-plates have been previously formed by casting metal in a mold. Considerable difficulty is however experienced in getting such cast end-plates sufliciently true, whereby a good deal of machine work must be done upon the same It is one of the objects of this invention to provide a pole end-plate which will be cheaper than those hitherto utilized and yet be efficient and satisfy the desired requirements of such an article. It is a further object of the invention to provide a. pole endplate involving less delay in manufacture and in the production of which no molding,

casting or machine work is necessary.

Still another object of the invention is the provision of a fabricated pole end-platehaving a braced lateral projection serving to hold or help to hold a field Winding in place. Other obj ects will appear hereinafter as the description of the invention proceeds.

The novel features of the invention will appear from this specification and" the accompanying drawings forming a part thereof and disclosing several embodiments of the invention and all these novel features are intended to be pointed out in the claims.

In the drawings, Fig. 1 is a front elevation of a fragment of a revolving field mem ber embodying the features of the invention. Fig. 2 is a front elevation of a. pole endplate embodying the features of the inven tion show-n in assembled relation with re spect to a pole piece proper and a field winding, the latter being broken away to show the end-plate. Fig. 3 is a fragmentary plan view of the construction of Fig. 2, also showing a portion of the pole piece proper.

Fig. 4 is a side elevation of a pole piece provided with end-plates constructed in accordance with the present invention, a portion of the field winding being broken away to more of the outer member .15.

1921. Serial No. 475,516.

clearly show one of-the end-plates. Figs. 5 and Gare fragmentary front and 'lan views respectively of a modification. 1* igs. 7 and 8 are fragmentary plan and side views re spectively of still another modification.

Referring to Fig. l of the drawings, a revolving field member 10 is here shown as provided with a core 12 carrying any desired number of pole pieces 13, preferably built up out of laminae, held together by endplates constructed in accordance with the present invention. The pole pieces proper andend-plates are here shown as surrounded by field windings 14.

Referring now to Figs. 2,8 and 4 for a better detail understandingof the construction of the end-plates, the end-plate shown in these figures include what may be here termed, for the-sake. of convenience,an outer member 15. This outer member is here shown as having the same shape as a pole punching such as form the laminae of the pole proper. That portion of the outer member surrounded by the winding let'may be designated, in general, as the body portion. The polar portion 16 of the outer member 15 is bent out of the general plane or at an angle to the body portion to form what may be termed a shelf. In the instance shown the polar portion 16 is bent :along a generally peripheral line and extends at right anglesto the body portion. Inasmuch as the outer member, in this case, is of the same shape as a pole punching, it has pole tip portions 17 also forming part of the polar portion and of the shelf.

The pole end-plate further .comprises what may be termed an inner member 22. This inner member is here shown as also 'of the same shape as a pole punching. The inner member thus has a polar portion 18 and pole tip portions 19. The pole tip portions 19 of the inner member are bent out of thecgeneral plane of the inner member 22 so as to present edge portions to the bent polar portion In the instance shown the pole tip portions 19 are bent along a radial line to a desired extent, here indicated as lessthan a right angle. The extent to which the pole tip portions 19 are bent out of the general plane of the inner member is a matter of choice.

The outer and inner member :15, 22 of the pole end-plates are preferably fastened to gether and this may be efficiently and expeditiously accomplished by means of spot welds 21 of any desired number. The pole tips 19 may also be fastened in any desirable manner to the polar portion 16 or pole tips 17, as by riveting or otherwise. In the instance shown these members are preferably fastened together by means of a weld or Welds 23.

Dependent upon the general configuration of the pole end-plate and its mechanical characteristics, it may be desirable to add one or more reinforcing members 24, which in the instance shown, have the form of right-angled sectors in engagement with and fastened to the polar portions of both the outer and inner members. While any suitable means of fastening may be utilized, the reinforcing members 24 are here shown as fastened to the polar portions by means of a weld Or welds 25.

The outer and inner members constituting Y the pole end-plate may be provided with any suitable number of holes 20 registering with similar holes in the pole piece proper, through which may extend belts or rivets (not shown) for holding the end-plates against the pole piece proper.

In the embodiment of the invention shown in Fig. 3 the shape of the polar portion and pole tips is such that when the pole tips 19 are bent on a radial line as shown and described the pole tips may assume any angle with respect to the body portion of the inner member without extending over the polar portion or pole tips of the outer member. In case the pole tips are long compared to the height of the polar portion or the height of the pole tips, as illustrated in the modification of Figs. 5 and 6, it may be necessary to grind off or otherwise remove a portion of the ends of the pole tips of the. inner member so as to bring said ends flush with the edge of the bent polar portion or pole tips of the outer member. The parts in Figs. 5 and 6 similar to those in Figs. 2 and 3 are numbered the same except for the addition of numeral 100.

It may occur that the shelf formed by the bent polar portion of the outer member will not be long enough to satisfy the desired requirements. In this case the outer member will not be of the same shape as a pole punching but may be of any desired form. An instance satisfying such a requirement is illustrated in Figs. 7 and 8. In this case the outer member 215 has a much higher or longer polar portion than the inner member 222. The polar portion 216 is here also shown provided with pole tip portions 217. lVhere the outer member is made of different form than the inner member the shape of the shelf formed by the bent po r portion of the outer member may be readily made so that when the pole tips 219 are bent to the desired angle the ends of said pole tips will be flush with the edge of the bent polar portion and thus no grinding will be necessary. The parts of Figs. 7 and 8 similar to those of Figs. 3 and 4c are numbered the same except for the addition of the numeral 100.

It is apparent that neither the outer nor inner member need be of the same shape as a pole punching although if they are, the same die may be used as is used for the pole punchings. In case the pole punchings have no pole tips, the inner member, if of the same general shape as a pole punching, may be slitted from a lateral edge in a peripheral direction to a desired extent and the slitted portion bent in the same manner as would a pole tip, the inner and outer members being then associated with each other in a manner analogous to that described in connection with Figs. 2 to 8.

It should be understood that it is not desired to limit the invention claimed to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. A pole end-plate built up out of sheet stock, comprising a member bent out of its general plane at one end to form a shelf, a second member having a portion thereof bent out of its general plane and forming a brace for said shelf, and a reinforcing member engaging said shelf and said second member.

2. A pole end-plate built up out of sheet stock. comprising a member having a portion thereof bent out of its general plane, and a member fastened to said first member and providing a lateral projection thereon, said bent portion providing a brace for said lateral projection.

3. A pole end-plate built up out of sheet stock, comprising a member made of a pole punching and having a pole-engageablc face, said member having a portion thereof bent out of its general plane, a second member forming the outer face of said pole endplate and having a portion thereof bent out of its general plane to form a shelf, said bent portion of said first member forming a brace for said shelf.

4. A pole end-plate built up out of sheet stock, comprising a member having a poleengageable face, said member having a por tion thereof bent out of its general plane, a second member made of a pole punching, forming the outer face of said pole endplate and having a portion thereof bent out of the general plane of said member and forming a shelf, said bent portion of said first member forming a brace for said shelf.

5. A pole end-plate built up out of sheet stock, comprising a member having a body portion and a polar portion, said member having its polar portion bent out of the plane of its body portion, a second member having the shape of a pole punching with pole tips, said second member having the said pole tips bent out of its own general plane and presenting edge portions to said bent polar portion, and a reinforcing member engaging the polar portions of both of said members.

6 A pole end-plate built up out of sheet stock, comprising a member having the shape of a pole punching With pole tips, said member having its polar portion bent out of the plane of its body portion, a second member having the shape of a pole punching with pole tips, said second member having the said pole tips bent out of its own general plane and presenting edge portions to said bent polar portion, and a reinforcing men'iber engaging the polar portions of both of said members.

7. A pole end-plate built up out of sheet stock, comprising a member bent out of its general plane at one end to form a shelf, a second member having a portion thereof bent out of its general plane and forming a brace for said shelf.

8. A pole end-plate built up out of sheet stock, comprising a member bent out of its general plane at one end to form a shelf, a second member having a portion thereof bent out of its general plane and presenting an edge portion to said shelf to brace the same.

9. A pole end-plate built up out of sheet stock, comprising a member bent out of its general plane at one end to form a shelf, a second member having a portion thereof bent out of its general plane and presenting an edge portion to said shelf to brace the same, said edge portion and shelf being fas tened to each other by a Weld.

10. A pole end-plate built up out of sheet stock, comprising a member bent out of its general plane at one end to form a shelf, a second member having a portion thereof bent out of its general plane and forming a brace for said shelf, said portion and shelf being fastened to each other by a Weld.

In testimony whereof the signature of the inventor is affixed hereto.

ROBERT W. BOROHARD. 

